Other apps have the feature where if a client sends you a video of an exercise they are doing you could slow down the video to various speeds. I think this is really important because you can pick up on compensations when observing how a client is moving by slowing a video down. This can be hard to tell in person or by video in real time. But if my client were to send me a recorded video of an exercise s/he is doing and when I receive it I can slow it down... I will be able to pick up on compensations such as rib thrust, breathing patterns, using one's back, certain gait patterns etc. I work with clients post rehabilitation so I feel that this feature is very important for my programming and also to show my clients. I think everyone could use this feature since we are all movement specialists and it is not always easy to pick up on these things in real time.